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cross-sectional deformation behavior of double-ridged rectangular tube with fillers in different stages of H-typed bending

引用

Chinese Journal of Aeronautics 2020年第6期33卷 1799-1811页

作者： Chunmei LIU Yuli LIU Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China

The bent double-ridged rectangular tube(DRRT)with high forming quality is helpful to improve the microwave transmission *** reducing the cross-sectional deformation in the H-typed bending process,in addition to using rigid mandrel to support the inside of tube,ridge groove fillers are also added to restrict the deformation of ridge *** of the change of stress and strain state of bent tube in bending,rigid mandrel retracting and specially twicespringback stages,and the springback of fillers,the cross-sectional deformation of tube in each stage may be ***,based on the ABAQUS platform,the finite element models(FEM)for H-typed bending,mandrel retracting and twice-springback stages of H96 DRRT with fillers were established and *** is found that,for the height and width deformation of tube and spacing deformation of ridge grooves,retraction of mandrel can make the distribution of these deformations more uniform along the bending *** first springback can reduce these deformations significantly,which should be *** the second springback only increases them by less amount,which can be *** smaller height deformation of ridge groove and filler can be neglected.

关键词： cross-sectional deformation FE simulation H96 double-ridged rectangular tube H-typed rotary draw bending Ridge groove fillers Twice-springback stage

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cross-sectional deformation of H96 brass double-ridged rectangular tube in rotary draw bending process with different yield criteria

引用

Chinese Journal of Aeronautics 2020年第6期33卷 1788-1798页

作者： Yangyang XIA Yuli LIU Mengmeng LIU Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China State Key Laboratory Solidification Process School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China

Different yield criterion has great difference in predicting the deformation of tube with different *** order to improve the prediction accuracy of the cross-sectional deformation of the double-ridged rectangular tube(DRRT)during rotary draw bending(RDB)process,Mises isotropic yield criterion,Hill’48 and Barlat/Lian anisotropic yield criteria commonly used in practical engineering are introduced to simulate RDB of *** inverse method combining uniaxial tensile test of whole tube and response surface methodology was proposed to identify the parameters of Hill’48 and Barlat/Lian yield criteria of small-sized H96 brass extrusion DRRT as *** based on ABAQUS/Explicit platform,the FE models of RDB process of DRRT considering Mises,Hill’48 and Barlat/Lian yield criteria were *** results show that:The variation trend of cross-sectional deformation ratio is same when using different yield *** cross-sectional deformation ratio by using Mises yield criterion is close to that by using Hill’48 yield ***,there is a quite difference between by using Barlat/Lian yield criterion and by using Mises or Hill’48 yield *** prediction values of cross-sectional height deformation by using three yield criteria all underestimate the experiment ones,and the prediction values of cross-sectional width deformation overestimate the experiment *** comparing the simulation results of cross-sectional deformation of the DRRT with different yield criteria and experiment ones,Barlat/Lian yield criterion is found to be suitable for describing the RDB process of DRRT.

关键词： Anisotropy yield criterion cross-sectional deformation H96 double-ridged rectangular tube H-type rotary draw bending Inverse method

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